Récemment deux articles publiés dans Science (sur les Océans) et Nature [1] ont porté sur le dégel des sols. Les scientifiques sont préoccupés par la fonte du pergélisol, vous savez cette partie du sol, gelée toute l’année pendant au moins deux ans. Vous avez peut-être entendu parler du terme « Permafrost » qui désigne la même chose ! (mais c’est le terme « anglais »). Le pergélisol contient de la terre, des morceaux de roches, des sédiments, un peu de glace et de la matière organique (donc du carbone imbriqué dans des liaisons chimiques). Cela concerne des zones des hautes latitudes (Groenland, Alaska, Canada, Sibérie) et de façon plus éparse la haute altitude (on parle par exemple du per
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